Belt-sewing machine.



PL HELDMANN. BELT SEWING monmrz.

APPLIOATION FILED SEPT. 22, 1910.

Patented Jan. 23, 1912.

e sums-sum 1.

A J n f/YVE/VTOR W/T/YESSES P. HELDMANN BELT SEWING MAOEINE. APPLIOATIOH IILED SEPT. 22, 1910.

Patented Jan.23, 1912.

e snaps-sum 2. 82 83 4'- ?65 6'4 P. HBLDMANN. BELT SEWING MACHINE. urmonmn Hum 5mm. 22, 1910.

Patented 'Jan. 23, 1912.

6 SHEETS-SHEET 3.

WITNESSES l/VVE/VTOR: I

P. HELDMANN.

BELT SEWING MAGHINB.

nrmonlox FILED snrrr. 22. 1910.

1,015,438. I Patented Jan. 23, 1912.

8 SHEETS-11313 4.

CAM

P. HELDMANN.

BELT SEWING MACHINE. APPLICATION FILED SEPT. 22, 1910.

Patented Jan. 23, 1912.

B SHEETS-SHEET 6.

P. HELDMANN.

BELT SEWING MACHINE.

APPLIGA'I'ION FILED SEPT. 22, 1910.

Patented Jan. 23, 1912.

6 SHEETS-SHEET 6.

' 1w r/v/sss s UNITED STATES PATE OFFICE.

PETER HELDMANN, or rnan'xronT-on-Tnrrmnm, Grimm, Assxenor. To THE CORPORATION or mnscnmnnrnnnrx MOENUS A. a, or. rmnxronr on-rnn- MAIN, GERMANY.

BELT-SEWING rrncnixm.

Patented Jail. 23,1912.

Application filed September 22, 1910. Serial No. 5818,2021.

To all whom it may concern: 1

' Be it known that I, PETER HELDMANN, a

subject of the Grand Duke of Hesse-Nassau,

residing at 92 Moltke Alle, F rankfort-onthe-Maln, in the Kingdom of Prussia and Empire of Germany, have invented certain new and useful Improvements in Belt-Sewing Machines, of which the followingis a specification, reference being had thereln to the accompanying drawmgs.

' This invention relates to belt-sewing machines designed for produclng a -z1g-zag seam by meansof a two pointed needle, and

varying thickness of the work, a uniform and short stitch crown is always obtained, which is especially of importance on the driving side of belt, to protect the seam against wear; for the same purpose other devices are provided which protect the leather laces from accidental damage during the sewing, and vallow of the seam being tightened and the leather lace being drawn.

into the surface of the belt, wi thout dimin-' ishing the rapidity of the sewing.

A constructional form of the invention is illustrated in the accompanying drawings,

which form part of this specification. I p Figure 1 shows a side elevation of the machine. Fig. 2 is a front elevation of the same as seen in the direction of the arrow A. Fig. 3 shows a front elevation of the devices for tilting the table- Figs. 4 and'5 areviews ofthe work table shown-diagram-v matically in its two slanting positions and Fig. 6 is a side view of the table partly in section. Figs. 7 and 8 are respectively a plan and front view of the same. Fig. 9 is' a cross section of thetable as seen when looking in the direction of the arrow B, Fig. '7. .Fig. 10 is an enlarged view of details shown-in Fig. 8. Fig. 11' isa sectional View of the table, needle and lace pressing devices. Fig. 12 is an enlarged view of one of the lace pressing devices. Fig. 13 is 'a view in'persp'ect'ive of one of the lace pressto slide to and froin guides 7. Inthe con-.

structional form shown in the drawings, the needle holders 6 move up and down above andbelow the table 2. Levers 8 are provided forthe tightening of the leather laces. The table, the needle. holders,

described are actuated from the main drivingmechanism of the machine. The shaft 9 of the driving pulley 10 carries a gear wheel 11, which engages the gear wheel 13 keyed to the main shaft 12 and turns this shaft in the direction of the arrow. B

the tightening. levers and all the other devices hereinafter.

. 3 means of the gear wheels 13 and'14' the shaft 15 with the upper tightening lever 8 is .actuated, whereasthe lower tightening lever 8 receives its rotary movement through the gearwheel 16, also keyed, to the main shaft 12, the intermediate gear wheel 17- and" through a gear'wheel 19 keyed to the shaft 18. The main shaft 12 carries furthermore a cam disk 20 provided with two'cam slots 21 and 22. In the slot 21 the guide roller 23of the bar 24 is guided, the ends of which are Inovably connected with thelevers 26 which can swing around the bolts 25. The

oscillating levers 26 actuated by the rota- 'tion of the cam, impart up and down motion to the needle holders 6. Through the cam slot 22 a lever 29, pivotally mounted at 28. on the frame and provided with. a roller 27 receives its motion (see Fig. 3), which by means of the rod 30, an arm 31, the shaft 32,

another arm 33 and the, rods 34 is transmitted to the table 2 and causes the tilting of the same from one-slanting position to the other (Figs. 1 and 2). The two slanting positions of the table'2 are indicated in the diagrammatic views Figs. 4; and 5.

The table is formed of a frame rovided with a slot 35; in the end parts 0 the former the feed roller 36 rests. 'Against this latter'a roller 38 held'in swing levers 37 is pressed by spri 39 (Fig. 8) to keep the work between thi tworollers in contact with the feed roller 36 and to guide it during the feed. The necessary space between the two rollers is maintained by the adjusting screws provided at each end. Fastened to the shaft of the feed roller 36 is a gear wheel 41 which engages a gear wheel 42. The gear wheel 42 is connected with a collar 43 and rests with the same in the forked lever 44, pivoted at 45-to one side of the table. 2 (Figs. 7, 8 and 10). The forked lever 44 protrudes into a bearing 46 pivotally fastened to the slide 47 adapted to be displaced sidewise. The slide 47 is guided. by a shaft 48., carrying the gear wheels 3;, 50, of which the former 49 engages gear wheel 52 one spindle 51. The spindle 51 is threaded and extends through the slide 47 The gear wheel 50 of the shaft 48 engages a rack 53 which has on its end a segment-like pressure-piece 54. The shaft 48, the spindle 51 and the rack 53 are housed in a casing 55 provided on the stand 1. These devices of work table 2 serve as means for feeding the work forward and to adjust the amount of the feed;

If the table tilts from the position indicated in dotted lines in Fig. 8 to the other slanting position, the forked lever 44 holding the gear wheel 42 with the collar 43 takes part in such tilting movement, being fastened by its bolt 45 to the table 2. During this movement one end of the forkedlever 44 can slide freely in the rotatable bearing 46. At the same time the gear wheel 42 receives a rotary motion and transmits the same to the gear wheel 41 and to the feed roller 36 through which the work is moved forward a certain normal distance (stitch length), this taking place according to the invention only after every second stitch. This is only necessary on account of work table 2 being mounted eccentrically. Its pivot is, as Fig. 4 shows, below the middle of the table, a little below the under surface of the work, so that after a stitch from above has been effected the stitch on the underside moves a short distance sidewise from the vertical needle track during the tilting of the table to its other slanting position (Fig. 5), thereby determining at the same time the penetrating point for the penetration from below. Only before the next penetration directed downward, the feed of the work has again to take place.

The gear wheel 42 which rests in the forked lever 44 and effects the rotation of the feed roller 36, is prevented from turning backward by check devices. The check devices, one of which is provided on the forked lever 44 and the other on the side of the table 2 consist of rollers 57 which by means of springs 58 are pressed against the collar '43 connected with the gear wheel 42. The

gear wheel 41 is mounted upon a sleeve 56 slidably fastened by key and keyway to the shaft of the feed roller 36, thereby enabling the gear wheel 41 to be moved away from the gear wheel 42.-

The automatic determination of the stitch point to secure shortand uniform stitch crown is attained throu h the following devices. On the table 2, 1n bearings 59 a bell-crank lever 60 is pivotally mounted, one arm of which is provided with a roller 62 which touches the up er surface of the work (the belt to be sewed running through the table, in the closest proximity to the vertical needle track indicated by the lines NN in Fig. 6. The other arm of the bellcrank lever 60 bears against an arm 64 which is provided with a roller 63 and which forms one end of the rod 67 mounted in bearings 65 and 66. The other end of the rod 67 has also an arm 68 which carries a roller 69. This roller bears against the segment-shaped pressure piece-54 of the rack 53. The contact of both parts 54, 69 is maintained by a spring 70. While introducing and conducting the wfork the feeler roller 62 comes in contact with its surface. According to the varying thickness of the work the roller changing its position in the vertical direction causes the bell-crank lever 60 to turn correspondingly. Thus a lateral displacement of the rod 67 and of the rack 53 against the action of the spring 70 takes place and by means of the gear wheel 50 acting together with the rack 53, and also the gear wheels 49, 52 and the screw threaded spindle 51, the slide 47 is displaced sidewise, thereby shifting the fulcrum (bear-' ing 46) of the forked lever 44. This shift-- ing of the fulcrum causes the amount of the feed of the work due to the tilting of the work table 2 to be lengthened or shortened. The amount of the feed is therefore automatically adjusted to a corresponding extent, so that notwithstanding the variation in the thickness of the work the stitch point is determined regularly. To aid this device, which is of great importance for a regular sewing, another device acting in con unction with the' former is provided which keeps the determined stitch point free, thereby enabling the stitch to be made quite close to the previous stitch. This device is constructed as follows: A guide rod 71 is provided above and below the work in the frame of the table 2'(Figs. 6, 7 11, 12, 13, and 19), and on this guide is a slide carrying a fork 72 and arm 3, and furthermore a )resser foot 75 adapted to turn on the bolt- (4. The presser foot has the form especially shown in Fig. 13; its front edge terminates book like in a narrow rounded edge 76 whereby the resser foot, through the action of a spring 77, is pressed against the work at the seam. Bolts 78 fastened tothe machine frame'l engage the fork 72 of the slides, so that in the tilting of the work table lateral motion is imparted to the two slides on their guide rods 71. If now for example -(Fig. 13) the leather lace is drawn from below through the work and thetable,'to prepare for a new stitch, tilts to another slanting position, the presser foot 75 will by'its lower edge 76 bear against the leather lace, turn sidewise away ,from the needle track and push the leather lace lying below along with it. In this manner the stitch point is exposedand the stitch can be effected inin'nnediate proximity to the last stitch (Figs- 11- and 12): The resser fopt' 75'l1as a rounded surface at its ront' end 1n.

order that, until the pull through the work is almost completed, the leather lace',a which with a fresh stitch finally terminates in a small loop (indicated in the dotted'lines Fig. 13) can easily slide off and be drawn tight. The same operation is repeatedalternately above and below the work table.

The arm 73 of each of the slides pro vided on the guide rod 71 servesto guide the needle 5 immediately above the work so that the needle will not slide accidentally.

from the stitch point or break.

' To secure the work in its adjusted position against accidental displacement, which may happen in consequence of the push eX-. ert-ed by the needle upon the slanting work,

use is made of an automatic holding deviceconstructed as follows. In the table frame. a slide 79 is arranged which bears with.

two wedge-shaped faces on the table frame and which rest with its lower surface onthe upper surface of the work (Figs. 6, 7, 9, 11 and 12). The slide 79 acts by the bolt 80 upon one end of a lever 82 which has its fulcrum at 81 and the other end of which is connected by means of the bolt 83 to another lever 84. Lever 84 has its fulcrum at 85 and. is pressedagainst the lever 82 by the spring 86, thus causing at the same time the inward movement of the slide 79 in an opposite direction to that of the feed. This movement of the slide 79, owing to the action of the wedge shaped face, causes the same to be pressed upon the work so as to secure its positions in the table. The automatic feed of the work is not hindered by this arrangement, as at this time the wedge shaped faces of the slide 7 9 and the frame 2 separate, so that the slide 79 releases the work. If desired the action of the slide 79 may also be suppressed if the lever 82 is turn-ed by hand against the action of the sprin actuated lever 84, thus withdrawing the slide from the frame 2. The position of rest of the lever 82 is maintained by the catch-bolt 88 provided thereon, this bolt being actuated by a spring 87 and adapted to enter the table frame, the latter being pro vided with an opening for the reception thereof so disposed as to hold the said lever in its position of rest.

' The new machine has further contrivfances which contribute toward the production of a uniform seam. First there are the de--.

leather lace properly and also to obviate damage to the same during the sewing, the leather lace being diverted automatically as to exclude alljliability' to damage.

Each needle-holder-guide 7 is provided vices acting in such a manner as to feed'the from the needle track during the upward movement of the'needle, and being held-so i v with abellcrankile'ver 89 .(Figs. 16, 17, 18,-

19, 21. and22) which is held in a normal position determined by a stop 92, by means-- of a spring 91 and carrying on its short arm a roller 90. The long armof the'bell-crank lever-89 has atits end alfinger 94' adapted to turn on the bolt 93, the said finger being pressed against the stop .96 through the spiral spring 95, while a resilient locking catch 97 bears against the point of the finger 94. Each needle holder 6- has on itsside a curved projection 98 which comes in contact with the roller 90 during the to and fro motion of the needle holder and causes tt. 2. bell crank lever 89 to-swing.

The normal position of the bell crank 1ever 89'is the one in which, when crossing the needle track its end provided with the resilient finger 94 is turned toward the opposite needle side and incloses the'leather lace between the parts 94 and 97.- As soon asthe needle holder 6, carrying the needle 5 (for example the upper holder in Fig. 21)

begins its inovementfor the stitch the lever 89 swings sidewise (in the drawing to the right as indicated in dotted lines), and in the further motion of the needle holder pulls the leather lace together with the needle tongue 111 sidewise. This'preventsthe entanglement of the leather lace andthe accidental entrance of the same into the needle track, whereby the lace might be damaged. Moreover the needle tongue is caused to pass to its position preparatory to the new stitch thus insuring a regular insertion. of the leather lace into the work. When-the other needle holder 6 (in the drawings Figs.- 21 and 22 the lower holder) takes up the needle (Fig. 22) and pulls the leather lace through to the other side, the lace can easily be released by the resilient finger 94 on the bellcrank lever 89, as it slides down the slanting surface of the same and overcoming .the power of the spring 97, leaves table 2 guides 99 are mounted on the machine frame 1; in each of these guides 1s a slide 100 carrying a pair of pincers 101, the jaws of which turn on bolts 102 and Wl'llCh are kept open by means of the spr1ng 103. Two springs 104 connect each slide 100 with a rod 105 (Fig. 1) which engages the cam disk 108 by means of a roller 107 provided atits end guided in the block 106. The cam disk 108 is secured to the main shaft 12 and in its rotation imparts alternate to-and-fro movement to the two rods 105, thus actuating each of the pincers 101. In the forward movement of rod 105 with the slide 100 in the direction of the arrow 0, this slide pushes against the catch 109 (Fig. 19)

and stops, while the rod, overcoming the its way between the work, and the tightening lever 8, it is furthermore guided by the roller 112 which is fastened by means of a small lever 114 to a bolt 113 combined with I the slidable' rod 105. The roller 112 is mounted in such a way that the tightenlng of the leather lace takes place as near as practicable in the line of the stitch. The

bolt 113 is provided on its end, which enters the boss 115, with a groove 116 which is-engaged by an adjusting screw 117. Thereby enabling the bolt 113 and consequently the position of the guide roller 112 to be adjusted.

At the end of.,the tightening lever 8 a body is pivotally mounted provided with 4 rollers 118 (Figs. 14 and 15) and with ratchet teeth 119,,this body being held in a certain position by means of the lever 121 subjected to the action of the spring 120 and provided with the check roller 122. One or the other of the rollers 118 acts as a carrier during the tightening of the leather lace and changes its position on a certain tension of the leather lace being reached as the roller carrier completes a revolution and another roller 118 takes place of the former. Meanwhile the leather lace has left the tightening lever and can be' introduced at the new stitch point without any obstacle. v

To secure the alternate passage of the needle 5from one needle holder 6 to the other, rovision is made, in the constructional orm of the machine shown, of a cam disk 123 arranged on the main shaft 12 (Figs-1, 3 and 22) andprovided with a place.

cam surface against the periphery of which two levers 125 furnished with rollers 124 are pressed by means of the spring 120. With the extreme end of each of these levers 125 engages an arm 127 of the shaft 128 mounted on the machine framel. The

shaft 128 extends to the guide 7 and has a lever 129 which protrudes into the path of the resilient check lever 130 which is borne laterally on the needle holder 6. When one needleholder 6 has reached'the position where the needle has been given to the other needle holder 6, the lever 129 moves the check lever 130 of the first named lever and the holding nose 131 releases the needle 5 (Fig. 22,-upper needle holder).

In short, the operation ofihe machine is as followrz The lower needle holder with the needle and the leather lace attached to the latter ascends, executes the first stitch .at the point previously exposed and gives the needle to the upper needle holder. As soon as-the latter has reached its uppermost position the leather lace is caught by the holding device (the pincers 101). At the same moment the tightening lever 8 begins to pull the leather lace tight in the work.

hile the stitching and tightening of the lace is still in progress, the tilting of the work table commences and shortly afterward the upper needle holder 6 commences its return or downward movement. The holding device (pincers 101) has in the meantime released the leather lace. During the downward movement of the needle holder the diverting device (lever 89 etc.) comes into action and prepares the needle tongue with the leather laces for a new stitch, which occurs immediately after the tilting of the table which has already taken At the moment when both needle holders meet, the needle fastens itself again in the lower needle holder and the operation is repeated.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1; In a device for sewing belts with leather laces, a table, feeding means automatically actuated by said table, automatic devices embodying a resiliently controlled presser foot and a slide having a wedgeshaped face for pressing down the work to secure it in position on the table.

2. In a machine for sewing belts with leather laces, a tilting work table, a needle, feeding means automatically actuated by .the tilting of said table, a resilient presser misses "8 foot constructed to push thelace after each stitch tohold it.

4. In a machine for sewing belts -with leather laces, a needle, automatic devices embodying a. resilient presser' foot for pushing the lace after each stitch and holding it,

means embodying a resilient finger for diverging the lace during the upward movement of the needle, a tilting work-table, means automatically actuated by said table to feed the work, and means-for tightening the lace,

5. In a machine for sewing belts with leather laces, a tiltably mounted work-table,

7 it and for freeing the stitch means automatically actuated by said table for feeding the work, a slide having a wedge-shaped face for pressing down the work and a resilient presser foot constructed to push the lace after each stitch and t0 hold'it.

6. In a machine for sewing belts with leather laces, a tiltably'mounted work-table,

cans automatically actuated by said table or feeding the work, a slide having .a

wedge-shaped face for pressing down the work, a resilient presser foot constructed to push the lace after each stitch and to hold it, and for freeing the stitch point after each stitch. Y

7. In a machine for sewing belts with leather laces, a tiltably mounted work-table, means automatically actuated by said table for feeding the work, a slide having a wedge-shaped face for pressing down. the work, a resilient presser foot constructed to push the lace after eachstitch and to hold int after each stitch, and means constructs to support the needle immediately above the work to prevent the needle from sliding accidentally from the stitch point.

' 8. In. a machine for sewing belts with leather laces, a work table mounted to tilt, means automatically actuated by said table to feed the work, a resilient presser foot for pushing the lace after each stitch and holding it, and a needle guide connected to said presser foot.

9. In a machine for sewingbelts with leather laces, a work table mounted to tilt, means automatically actuated by said table.

to feed the work, a resilient presser foot, for pushing the lace after eachstitch and holding it, and a needle guide connected to said presser foot constructed to guide the needle before each stitch. i

Ina machine-for sewing-belts, I

IeatherlaceS, afwork table mounted to tilt,- means automatically actuated by-saidftabl e to feed the-work, a resilient resser foot for pushing the lace after each stitch and hold-g ing it,- and a needle guide connected to said resser-foot constructed to guide the needl.

before each stitch, immediately above the stitch point.

11. In a machine for sewing belts with leather laces, a tilting work. table, feeding means automatically actuated by said table and a wedge clamp member constructed to act automatically after each feed of the work, a lace diverting device and a needle holder for actuating the same. a i '12. In a machine for sewing belts with leather laces, a tilting table, feeding means automatically actuated by said table and, a lace diverting device and a needle holder actuating the same. a

. 13. In a machine for sewing belts with leather laces, a tilting table and a lace diverting device,'and a needle holder for actuating'the same.

. 14.. In a" machine for sewing belts with leather laces, a tilting table, a lace diverting device, a needle holder for actuating the same, and a locking catch for cofiperation with the lace diverting device.

15. In a machine for-sewing belts with leather laces, a tilting table, a needle tongue, a gripping device for catching the lace and relieving said tongue of strain, and a slide movable crosswise to the path of the needle for cotiperation with the gripping device.

16. In a machine for sewing belts with leather laces, a tliting table, a needle tongue,

a gripping device for catching the lace and relieving said tongue of strain, a slide movable crosswise to the path of the needle for coiiperation with the gripping device, and a slide to which said gripping device is secured. v 7

17. In a machine for sewing belts with leatherlaces, a tilting table, a needle tongue, a gripping device for catching the lace and relieving said tongue of strain, a slide movable crosswise to the path of the needle for codperation with the gripping device, a slide to which said 'grippmg device is secured, and means for tightening the stitch adjacent to the line of perforation. 18.-In a machine for sewing belts with leather laces, a tilting work-table, and a gear wheel thereon rotatable in one direction only, and feeding means operatively' connected with said gear wheel.

19. In a machine for sewing belts with leather laces, a tiltable work table, a gear .wheel thereon rotatable in one direction only, a feeding device operatively connected with said gear wheel and a lever swinging with said table.

20. In a machine for sewing belts with.13 0

leather laces, a tiltable work table, a gear wheel 'thereon rotatable in onedirection only, a lever swinging with said table, a driving roller and a gear wheel for revolving s'aid roller.

21. In a machine for sewing belts with leather laces, a tiltable Work table, a gear Wheel thereon, rotatable in one direction only, a lever swinging withsaid table, a driving roller, a gear wheel for revolving said roller, a spindle and, a slide movable thereon and-in which said lever is fulcrnmed.

22. In a machine for sewing belts with leather laces, a tiltable work-table, means 5 actuating the same and means for automati- 20 eally tilting the work-table.

In testimony whereof I aflix my signature in the presence of two witnesses.

PETER HELDM'ANN.

Witnesses:

J nAN-GRUND, V CARL GRUND. 

